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[Bug 1795253] [NEW] Compiz crashed with SIGSEGV


Public bug reported:

On login, the desktop takes a long time to load, and when it does, everything blinks. It is possible (but difficult) to open a terminal and execute commands, through the right-click desktop menu.

I first noticed the issue in mid-July of 2018.

Acer 5100
Ubuntu 16.04 (64-bit)
Graphics card: VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RS482M [Mobility Radeon Xpress 200]

Possible red herring:
Believed to be mesa-related, as symptoms very similar to bug #1741447, which is a duplicate of #1735594. I have been informed by a mesa developer that it is different because that bug affects Intel GPUs. This system has a Radeon GPU. Ubuntu reports it as a Compiz issue, so best to begin from there?

I have attached a log that may be helpful.

Many thanks for any help.

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: compiz-core 1:
ProcVersionSignature: Ubuntu 4.4.0-135.161-generic 4.4.140
Uname: Linux 4.4.0-135-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CrashCounter: 1
CurrentDesktop: Unity
Date: Sun Sep 30 17:54:22 2018
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
ExecutablePath: /usr/bin/compiz
 Advanced Micro Devices, Inc. [AMD/ATI] RS482M [Mobility Radeon Xpress 200] [1002:5975] (prog-if 00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] RS482M [Mobility Radeon Xpress 200] [1025:009f]
InstallationDate: Installed on 2017-01-14 (624 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: Acer Aspire 5100
 Socket 0:
   no product info available
 Socket 0:
   no card
ProcCmdline: compiz
 PATH=(custom, user)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-135-generic root=UUID=246e11ef-bf05-4fc6-9bfc-18c8157ee7c6 ro persistent quiet splash vt.handoff=7
 Segfault happened at: 0x7f9b740092c9:	movdqu (%r8,%rbx,1),%xmm9
 PC (0x7f9b740092c9) ok
 source "(%r8,%rbx,1)" (0x0000035c) not located in a known VMA region (needed readable region)!
 destination "%xmm9" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: compiz
 #0  0x00007f9b740092c9 in ?? ()
 No symbol table info available.
 #1  0x0000000000000000 in ?? ()
 No symbol table info available.
 ?? ()
 ?? ()
Title: compiz crashed with SIGSEGV
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 08/22/2008
dmi.bios.vendor: Acer
dmi.bios.version: V3.13
dmi.board.name: Navarro
dmi.board.vendor: Acer
dmi.board.version: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAcer:bvrV3.13:bd08/22/2008:svnAcer:pnAspire5100:pvrV3.13:rvnAcer:rnNavarro:rvrN/A:cvnAcer:ct10:cvrN/A:
dmi.product.name: Aspire 5100
dmi.product.version: V3.13
dmi.sys.vendor: Acer
version.compiz: compiz 1:
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.91-2~16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~16.04.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~16.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.8
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Sun Sep 30 17:56:26 2018
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.18.4-0ubuntu0.8
xserver.video_driver: radeon

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-crash compiz-0.9 need-amd64-retrace ubuntu xenial

** Attachment added: "Extract from /var/log/syslog"

** Information type changed from Private to Public

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